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<?xml version="1.0" encoding="UTF-8"?>
<xbgf:sequence xmlns:xbgf="http://planet-sl.org/xbgf" xmlns:bgf="http://planet-sl.org/bgf">
<!-- special-block-and-more -->
<xbgf:massage>
<bgf:expression>
<choice>
<bgf:expression>
<nonterminal>newline</nonterminal>
</bgf:expression>
<bgf:expression>
<epsilon/>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<optional>
<bgf:expression>
<nonterminal>newline</nonterminal>
</bgf:expression>
</optional>
</bgf:expression>
</xbgf:massage>
<!-- isbn-number -->
<xbgf:abstractize>
<bgf:production>
<nonterminal>isbn-number</nonterminal>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>97</terminal>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<terminal>8</terminal>
</bgf:expression>
<bgf:expression>
<terminal>9</terminal>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<terminal> </terminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<marked>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
</marked>
</bgf:expression>
<bgf:expression>
<nonterminal>DIGIT</nonterminal>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<terminal> </terminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<marked>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
</marked>
</bgf:expression>
<bgf:expression>
<star>
<bgf:expression>
<terminal>9</terminal>
</bgf:expression>
</star>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<nonterminal>DIGIT</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>X</terminal>
</bgf:expression>
<bgf:expression>
<terminal>x</terminal>
</bgf:expression>
</choice>
</bgf:expression>
</sequence>
</bgf:expression>
</bgf:production>
</xbgf:abstractize>
<xbgf:widen>
<bgf:expression>
<choice>
<bgf:expression>
<terminal> </terminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<optional>
<bgf:expression>
<choice>
<bgf:expression>
<terminal> </terminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
</choice>
</bgf:expression>
</optional>
</bgf:expression>
<in>
<nonterminal>isbn-number</nonterminal>
</in>
</xbgf:widen>
</xbgf:sequence>